Geometric optics-based design of laser beam shapers

Shealy, David L.; Chao, Shao-Hua

doi:10.1117/1.1617311

Cited by 60 publications

(8 citation statements)

References 27 publications

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“…[9][10][11][12][13][14][15][16] For example, an analytical solution has been obtained by Dickey et al to convert a Gaussian beam into a circular or rectangular flattop beam. [9][10][11][12][13][14][15][16] For example, an analytical solution has been obtained by Dickey et al to convert a Gaussian beam into a circular or rectangular flattop beam.…”

Section: Doi: 101002/adom201800961mentioning

confidence: 99%

“…to obtain a desired intensity profile can be calculated numerically, and in some cases analytically. [9][10][11][12][13][14][15][16] For example, an analytical solution has been obtained by Dickey et al to convert a Gaussian beam into a circular or rectangular flattop beam. [9,10] A variety of approaches, mostly based on the Gerchberg-Saxton algorithm and its derivatives, [11][12][13][17][18][19] have been developed to calculate the desired phase profiles numerically.…”

Section: Doi: 101002/adom201800961mentioning

confidence: 99%

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Liquid Crystal Pancharatnam–Berry Micro‐Optical Elements for Laser Beam Shaping

Jiang

Feng

et al. 2018

Advanced Optical Materials

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Shaping the intensity profile of a laser beam is desired by various industrial applications. In this paper, a new approach is presented to design and fabricate liquid crystal (LC) micro‐optical elements (MOEs) with engineered Pancharatnam–Berry (PB) phases for beam shaping. By generalizing the Snell's law for spatially variant PB phases, molecular orientation patterns are designed for the liquid crystal MOEs to shape a Gaussian laser beam into flattop intensity profiles with circular and square cross‐sections, with the β parameter varied from 4 to 42. It is demonstrated that such liquid crystal beam shaping MOEs can be fabricated with high throughput and high resolution by using a photopatterning technique based on plasmonic metamasks and that they produce excellent beam quality, no zero‐order light leakage with a beam size from 10 to 600 µm. As the plasmonic metamasks allow for encoding arbitrary molecular orientations, i.e., arbitrary geometric phase profiles, the approaches presented here are widely applicable to large‐scale manufacturing of liquid crystal MOEs for any beam shapes.

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Section: Doi: 101002/adom201800961mentioning

confidence: 99%

Section: Doi: 101002/adom201800961mentioning

confidence: 99%

Liquid Crystal Pancharatnam–Berry Micro‐Optical Elements for Laser Beam Shaping

Jiang

Feng

et al. 2018

Advanced Optical Materials

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“…Such optical systems are not only limited to uniform profiles, they can be customised with technologies such as freeform lens manufacturing [31,32]. Other methods for generating custom beam profiles include diffractive optical elements [33][34][35], geometric optics [36] or scanning mirrors [37]. Recent advances in Vertical-Cavity Surface-Emitting Laser (VCSEL) technology have lead to the development of compact NIR emitting modules with powers in the kilowatt range [38].…”

Section: Introductionmentioning

confidence: 99%

An inverse model for optimisation of laser heat flux distributions in an automated laser tape placement process for carbon-fibre/PEEK

Stokes-Griffin

Compston

2016

Composites Part A: Applied Science and Manufacturing

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a b s t r a c tHigh power diode lasers have enabled higher placement rates to be achieved in automated tape placement (ATP) of thermoplastic-based composite materials. Laser ATP heads in published literature employ homogeneous linear or rectangular laser spots, however a variety of solutions are available to produce customised irradiance profiles. No efforts to date have investigated what a more ideal heat flux profile would be for laser ATP in terms of length and distribution. This paper describes a method to determine the required laser heat flux profiles to achieve desired heating zone temperature profiles by means of an inverse thermal model. A bonding model was implemented to assess the performance of various heating zone temperature profiles for placement at 400 mm/s. Short beam strengths from experimental trials were used to validate the bonding model. A two-stepped heating profile was found to provide a good balance of increased strength with a small increase in power requirement.

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“…Beam shaping is achieved by using specially designed optical surfaces to generate a predetermined irradiance/intensity distribution and wavefront distribution [4][5][6] . Simultaneous control of intensity and wavefront has always been a fundamental issue in geometric optics and optical design [7][8][9][10][11][12][13][14][15][16] . However, the output beam distribution generated by the beam shaping system is often one-to-one correspondence with the given incident beam, which means that for a fixed incident beam distribution, once the working distance between the beam shaping system and the source is fixed, the distribution of the output beam on the target plane cannot be changed.…”

Section: Introductionmentioning

confidence: 99%

Variable waist of angular Gaussian distribution laser beam shaping system with intensity and wavefront control

Li,

Xu,

Zheng

2023

Optoelectronic Imaging and Multimedia Technology X

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In recent years, the optical design of refractive beam shaping system has been widely studied. In laser beam shaping, because the laser light source is usually not uniformly distributed, to achieve uniform distribution or other predetermined wavefront and intensity distribution, it is necessary to use aspheric or freeform surface to build laser shaping system. However, the angular Gaussian distribution laser with different waist generally cannot be used in the same beam shaping system. We design a beam shaping system. When the incident angular Gaussian distribution beam has different waist, the output beam can always achieve the predetermined wavefront and intensity distribution. This work is challenging and rewarding. We propose a design framework, including the calculation and optimization process of the initial system. In the beam shaping system, when the waist of the incident angular Gaussian distribution beam varies widely, the output beam still maintains the predetermined wavefront and intensity distribution. A design example is given to verify the feasibility and effectiveness of the proposed beam shaping design method. This method can be used in the fields of laser imaging, laser display and laser processing. The high level of optical performance proves the effectiveness and feasibility of the proposed design method.

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Geometric optics-based design of laser beam shapers

Cited by 60 publications

References 27 publications

Liquid Crystal Pancharatnam–Berry Micro‐Optical Elements for Laser Beam Shaping

Liquid Crystal Pancharatnam–Berry Micro‐Optical Elements for Laser Beam Shaping

An inverse model for optimisation of laser heat flux distributions in an automated laser tape placement process for carbon-fibre/PEEK

Variable waist of angular Gaussian distribution laser beam shaping system with intensity and wavefront control

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